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Finding the Fourth Proportional to 380.45, 570.68 and 91.89

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Solution

The fourth proportional to 380.45, 570.68 and 91.89 is: 137.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.45 : 570.68 = 91.89 : x
  2. Step 2: Convert to fraction form
    380.45/570.68 = 91.89/x
  3. Step 3: Cross multiply
    380.45x = 570.68 × 91.89
  4. Step 4: Simplify right side
    380.45x = 52,439.56
  5. Step 5: Solve for x
    x = 52,439.56/380.45
  6. Step 6: Final answer
    x = 137.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.